Posture detector calibration and use

a technology of image detectors and calibration methods, applied in the field of image sensing methods and systems, can solve problems such as sudden drop in blood pressur

Active Publication Date: 2007-05-24
CARDIAC PACEMAKERS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0005] Embodiments of the invention relate to detection of patient posture. One embodiment of the invention involves a method for sensing posture. The outputs of one or more sensors disposed in relation to a patient's body are measured while the patient assumes a plurality of body postures. The one or more sensors are responsive to a gravitational field. A transfer matrix is formed having coefficients corresponding to the measured outputs. The transfer matrix defines a relationship between a coordinate sys...

Problems solved by technology

For example, changes in body posture can cause sudden decrease in blood pressure.
For some patients, particularly the elderly and/or people taking c...

Method used

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  • Posture detector calibration and use
  • Posture detector calibration and use
  • Posture detector calibration and use

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Embodiment Construction

[0035] In the following description of the illustrated embodiments, references are made to the accompanying drawings which form a part hereof, and in which are shown by way of illustration, various embodiments by which the invention may be practiced. It is to be understood that other embodiments may be utilized, and structural and functional changes may be made without departing from the scope of the present invention.

[0036] Patient posture is an important factor in the diagnosis of certain medical disorders and may also be used to enhance therapy delivery. Posture detection involves determining an orientation of the patient's body, such as determining if the patient is in a vertical position (upright or upside down), determining if the patient is in a horizontal position (lying on the back, lying on the stomach, lying on the right side or the left side), or determining if the patient's body is tilted to the right, tilted to the left, tilted forward, or tilted backward. Posture det...

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Abstract

Calibrating a posture detector for a patient's body involves measuring outputs of one or more sensors disposed in relation to the patient's body while the patient assumes a plurality of positions. A transfer matrix is formed having coefficients corresponding to the measured outputs. The transfer matrix defines a relationship between a coordinate system of the one or more sensors and a coordinate system of the patient's body. The body coordinate system is used as a reference coordinate system for posture detection. Posture, including tilt and/or tilt angle, may be determined based on first and second rotational angles defined in relation to the body coordinate system.

Description

FIELD OF THE INVENTION [0001] The present invention relates generally to posture sensing methods and systems. BACKGROUND OF THE INVENTION [0002] The position or posture of a patient is a factor in various diseases and disorders, including those of the cardiac and / or respiratory systems. Certain disease processes may be exacerbated when the patient assumes particular postures. For example, obstructive sleep apnea episodes may begin or increase in frequency or severity when the patient lies down. In another example, congestive heart failure (CHF) patients frequently sleep with their torso tilted upward to reduce pulmonary congestion. Patient posture information may be used to enhance diagnosis of these and other diseases and disorders. [0003] Posture sensing may also be used to enhance therapy delivery, such as cardiac pacing therapy. For example, changes in body posture can cause sudden decrease in blood pressure. For some patients, particularly the elderly and / or people taking certa...

Claims

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Application Information

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IPC IPC(8): A61B5/103
CPCA61B5/1116A61B5/686A61B2562/0219A61B5/1117
Inventor WANG, HUAHATLESTAD, JOHN
Owner CARDIAC PACEMAKERS INC
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